N-doped hierarchical porous carbon anchored tiny Pd NPs: A mild and efficient quinolines selective hydrogenation catalyst
| Autor: | Zhihong Li, Shuai Chen, Fengwei Zhang, Chunlan Ma, Xian-Ming Zhang, Jianfei Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Process Chemistry and Technology Quinoline 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Ionic liquid Leaching (metallurgy) Physical and Theoretical Chemistry Molten salt 0210 nano-technology Selectivity |
| Zdroj: | Molecular Catalysis. 452:145-153 |
| ISSN: | 2468-8231 |
| Popis: | Chemoselective hydrogenation of quinolines is often subjected to the problems of leaching and poisoning of catalytic active site as well as harsh reaction conditions. Developing a novel and high-performance heterogeneous catalyst is of paramount importance yet a huge challenge. Herein, we report a facile and efficient strategy for preparing the large surface area and highly N-doped hierarchical porous carbon anchored tiny Pd NPs catalyst, in which the low-cost chitosan, nitrogen-rich ionic liquids are served as composite precursors and KZ molten salt as friendly pore-forming agent. And a series of Pd@CIL-T (C refers to chitosan, IL refers to ionic liquid, T = 600–900 °C) catalysts are successfully fabricated via pyrolyzing aforesaid composites at different temperatures followed by anchoring the highly dispersed and small-sized Pd NPs on their surface. Among all the prepared catalysts, Pd@CIL-900 exhibits the optimal catalytic performance towards the selective hydrogenation of quinoline under extremely mild conditions (0.6 mol% Pd, 0.1 MPa H2 and 50 °C). The kinetic experiments further reveal that such hydrogenation is subject to a pseudo-first order reaction and the apparent activation energy is as low as 41.1 kJ/mol, demonstrating excellent hydrogenation reaction rate. Moreover, the catalytic activity and selectivity are well maintained even after being reused for fifth reaction cycles. |
| Databáze: | OpenAIRE |
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